В угол C величиной 50° вписана окружность, которая касается сторон угла в точках A и B. Найдите величину угла AOB в градусах.

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In ... fifteenth century ... people knew only three continents: ... Europe, ... Asia and ... Africa. They knew nothing about such ... big continent as ... America. ... man who discovered ... America was born in 1451 in ... Italy. His name was Christopher Columbus. He became ... sailor at ... early age. Knowing that ... Earth was round, he decided to reach ... India sailing to ... west. He tried to arrange ... expedition, but did not have ... money, and no­body wanted to help him. At last ... king of ... Spain gave him ... money for ... expedition. He set ... sail in 1492. ... voyage was very dangerous and difficult. On ... 12th of ... October his ship reached ... land. When they landed, they saw ... strange trees and ... flowers. ... men and ... women with ... olive-coloured skins gathered around ... sailors and looked at them with ... great surprise. Columbus was sure that he had discovered ... new way to ... India. Some time later ... other sailor reached ... America. ... name of ... sailor was Amerigo Vespucci. He understood that it was ... new continent.

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